4 September 2014 Determining x-ray spectra of radiographic sources with a Compton spectrometer
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Abstract
Flash radiography is a diagnostic with many physics applications, and the characterization of the energy spectra of such sources is of interest. A Compton spectrometer has been proposed to conduct these measurements. Our Compton spectrometer is a 300 kg neodymium-iron magnet constructed by Morgan et al1, and it is designed to measure spectra in the <1 MeV to 20 MeV range. In this device, the x-rays from a radiographic source are collimated into a narrow beam directed on a converter foil. The forward-selected Compton electrons that are ejected from the foil enter the magnetic field region of the spectrometer. The electrons are imaged on a focal plane, with their position determined as a function of their energy. The x-ray spectrum is then reconstructed. Challenges in obtaining these measurements include limited dose of x-rays and the short pulse duration (about 50 ns) for time-resolved measurements. Here we present energy calibration measurements of the spectrometer using a negative ion source. The resolution of the spectrometer was measured in previous calibration experiments to be the greater of 1% or 0.1 MeV/c1. The reconstruction of spectra from a bremsstrahlung source and Co-60 source are also presented.
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Amanda E. Gehring, Michelle A. Espy, Todd J. Haines, James F. Hunter, Nick S. P. King, Manuel J. Manard, Frank E. Merrill, George L. Morgan, Robert Sedillo, Rusty Trainham, Algis V. Urbaitis, Petr Volegov, "Determining x-ray spectra of radiographic sources with a Compton spectrometer", Proc. SPIE 9215, Radiation Detectors: Systems and Applications XV, 921508 (4 September 2014); doi: 10.1117/12.2065588; https://doi.org/10.1117/12.2065588
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